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The zwitterionic radicals HO-ĊH-CH(COO - )NH 3  +  (4a) and HO-Ċ(CH 3 )-CH(COO - )NH 3  +  (4b) are the main species produced upon OH ·  radical attack in aqueous solutions at pH 3-7 at the amino acids serine, HO-CH 2 -CH(COO - )NH 3  + , or threonine, HO-CH(CH 3 )-CH(COO - )NH 3  + , respectively. Both radicals undergo elimination of NH 4  +  ion to form the radicals O=CH-ĊH-COO -  (7) or CH 3 -CO-ĊH-COO -  (9) respectively.

Elimination of Ammonium Ion from the a-Hydroxyalkyl Radicals of Serine and Threonine in Aqueous Solution and the Difference in the Reaction Mechanism